>>> and white house lunch, president obama d mitt romney face to face for the first time since the campaign, tonight, how it went and what happened. >>> and tonight, the powerball winners, what we know, and who they are, and the secret code that could be in the numbers. nightly news begins now. >>> good evening, at a time when so many people are still suffering, right now tonight more than one month after a monster storm hit a giant population center, today we learned some facts about how this earth is changing and how fast. for starters, polar ice sheets in greenland are melting at five times the pace, than just a few years ago. new research shows that antarctica is melting. while it takes a lot of ice to melt the ocean levels they say that is in fact what is happening. and they believe just an incremental rise in the ocean levels made the damage worse when hurricane sandy hit the east coast and took so much away from us. the big question is the future, of course, and a new kind of normal for all of those living along the water. it is where we begin tonight, our chief environmental affairs